Growing Rosemary in Garissa

Soil suitability analysis based on Garissa's nutrient profile

Garissa County is a challenging environment for Rosemary (soil-match score 2/100) and will need significant amendment before planting. Local soils average pH 7.96 — alkaline and inside the 6–8 band Rosemary prefers, so no lime is usually required. The main gap is nitrogen — measured at N 0.61 g/kg, P 37.7 mg/kg, K 407 mg/kg against this crop's medium/medium/medium demand — so the fertilizer plan below prioritises closing that deficit. The county's predominantly sandy soils suit Rosemary, which favours sandy loam. Garissa receives approximately 250 mm/year — well below Rosemary's minimum of 400 mm — so supplemental irrigation would be essential for this crop. Rosemary's full potential is about 2,500 kg/acre (~KES 375,000/acre at KES 150/kg), but at Garissa's 2/100 suitability a realistic target here is closer to 63 kg/acre (~KES 9,450/acre) unless the constraints above are addressed.